Transition from CircleCI to GitHub actions

[nikitawootten-nist]

User Story:

As an OSCAL developer, I need a consistent CI/CD process.

Goals:

GitHub actions replacing the CircleCI testing and deployment tasks.

Dependencies:

None

Acceptance Criteria

• readme documentation affected by the changes in this issue have been updated.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR. (meta)